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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4008d9da04afc8be6cfd26ec7d248613dfa4c9cafbbbf6ea6e667b0a49011bf' 
  AND token = 'u8bauSl3eWTaNGCo4rwP2NqrCag78TSBdI13wT/YksE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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