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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87f18860f5a8f5e7a6338605ffcc7b110c23c23344c7b60ec122c6aa370b7dc0' 
  AND token = 'wABynedd4yYQst3wVWTgmbQPFOpj9449O9nIr47ORKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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