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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9af738b295e7f495e4577b2e1e948f82e07f7518100ddcaf7927cd26fbc08b17' 
  AND token = 'fdRrIvL6eLvG96774x5g075FauJ36CyKRAydQdpfMhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00394

JSON explain

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