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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '150c8d637bdaf16522b67949d47fd996ac03bf5c7284fc077489cecb43bcf559' 
  AND token = 'vzYiYKCab2XNn1hJaQQmhFfyjBmKeefOxs3e9Rsqi0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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