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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e670ca1d72d81adf0477bb5b1e6877201761def98e5afc7527837fca15ec9c7' 
  AND token = 'TLS2OehacorJq4cSHEedTUJCjl9HO8t4p21awGP2gvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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