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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e70b0709fc27faa6601c0e893501e8c6e823901be1d0fccdc455971b510d98af' 
  AND token = 'OOR7IjtBfJklpwWSjY518hgNKrF7duR7ImXog/kk7UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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