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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72f7748352f0886164d874d5f5b694cf9e3b3644d277150956e0aa51e81c6685' 
  AND token = 'fatRowJMZn3iVqV4sUshvIxzZ5FnU43r6bQqiai9syY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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