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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe574e2d7b4e99589710d7dfaa9cb3a1fb50c74c42ab76711ad64d7fdbf17d13' 
  AND token = 'Uq4ncyUV3mNZU6ba8DBgKRGGWWhAGPeIGkLop1EqRls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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