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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '609469f029796fb93c571c2d0f2730faf01ce873b17c29547d2f67af03f3071e' 
  AND token = 'BhxQWB4SsOpKoF0uppYQ9LnMz0i7vS1/3kJ9AFbVS0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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