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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c22b7e58b8c05ec34e42eaef0b35ef28035807623c14f76515dd56da671f8de' 
  AND token = 'qlL/oI8C6J7AqsiIzsiqfi6BxamOFjNZaxaW86LqMnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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