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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '694f52702bd8cda89e1d0ee5ef04eb12e85decb534a07d9d5e66cf3ef14497f2' 
  AND token = 'N2m4bPaQMbdALdts0UiXYPZmWUc4qluc+iM2S0CvBMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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