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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebfafaa594ce6f763116f6d96becbdc4edb9de4d8a9cafeb2212f5299b8c1635' 
  AND token = 'Zs+M5TykxazqKId42Y5eOCTlYouZzr4PIG3RBMqFuo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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