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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e90b25a54dd04b2335d3353f5ec208a3dd5650e17a2b4ab60dce94f843d80f1' 
  AND token = 'rkD4weu5HNd/pow2ShuPDq/H6acsZ83Z2WSEzYPyNLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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