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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5bc552cd413a25bd04991a49b81dac0c94dce622dbee9d287c9d3dea2c60af1' 
  AND token = 'b4rB6Eu5mEfT42eqahdmyPDB5JAipIzaThkULXDe1Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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