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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df96040a7407b8f3d457cc27e678a9248fd8025ecf695daf914b530a0f67582c' 
  AND token = '4jRpJPeYaJ7JAe+8uld41+cEnMH9vxgTwdpc90xJFKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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