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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9683d220d59c27ba8656f8c37d291fd8777e50e8d511b4b660f6a36da7cfed51' 
  AND token = 'UEwxVhQkaQgjbamBT5deMIkPGcMD3IScCchWD2WigZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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