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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f9fbf3e1eaa8a20e1b40f5dc642053144e5d1b0d1b82b977198a962dc048f04' 
  AND token = 'Oap+2cRNkI0T3+avmNemYmCFg/caAS7pccndeVt1yfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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