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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2559366b9d470b66755d8d3c7b0b02bb43a648544a3fef1dbc81562d15b184d3' 
  AND token = '5Ps5upUr4EEB70K9HdyGBmMyD5Ks5EjWs/dweBYZOTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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