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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86ab8d4b0391e802335fb8768a13a6ffc75913b79e95b0e112b2f972120d63d0' 
  AND token = 'P01U7+uwnymDpwRWhB2rOE/rWu38O1KbtvmDiQDK0Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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