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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a114034267597c4dbf7ec75fc47fb0b41b99517d2357f33d8cf6547dccb7608' 
  AND token = 'SxnWVx+dY7mjeXHCC4ji/UfqTFfadEfF7J/rO1fM3ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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