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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd53dc821c3c504b0b03753a1b787fc0e9fbe22751b1eb5741863f32e41ecf39e' 
  AND token = 'A/vEllG3q39+5Ky2v9oVQ6v3rXa8W3WuIR39KK8sPNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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