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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f25fd836bfeac1015a1eb8742deeef8fc5de8c7d042d53c1ed7ceb2839fbc7fc' 
  AND token = 'ujfRRqPxpzDmbXq18A+xsTIoL7spUDtnsdXzJX09BTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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