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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88691120a9cd1edfbc96cfb74c2c97ac5281f5c8f607f01b1f5c78730e21d91b' 
  AND token = '/mebSVfsuhO7NXPiHRCsSSVLgcZdQgvQMPFCXt8fzAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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