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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90ec53c1c04aafdc4159ff9c60b1928808bd324d31dfdcefb444572e29b28b52' 
  AND token = 'meTDeOQDi2CWKjdmKIH7nU9MRb30u+Re+vTqOZI01yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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