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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '647331d3742668d41ec13716d489cd8fc2c158d2e18499191bf2bb55926facc6' 
  AND token = 'HrWGjdQ7W808BjFMC1XsDHdf99wkiOnw8eTF2iBFHWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}