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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56715a5129ebd951872c9ba1e3b71a1f9853c81ddb22636ec4956a8fb26e681f' 
  AND token = '89nijNkc0qgOCdu78FttkLtdgMZtSBfcvUI9uwajyEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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