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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38c38a359c694de0fb83cdaa73734d206988840b45c9370b447d0bbf679a26a2' 
  AND token = 'i5pOBP4EjiAudnXp8H7oaqWTI0zOSySQ24cStMajwM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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