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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4f2f961db11e23217fff0e799f59bc5c0ac3096223e8a856245d3bb3e19500' 
  AND token = 'zEl/Pyt4UUVdnFlQEixhRKlFfR/dz6YCJdabYOiK+PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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