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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b3eeb18a2c71c8ed500f709f45070d120668210c098f4660c2a93a296277a2b' 
  AND token = 'JZ0Nn5AWNtC2dSg6H7wWgR3aJXCPfKlVDgfw7/ehz1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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