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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44581eb740e5a56169ce1660de386e0f92df3a41eaa12dbc8da26d74a9961dac' 
  AND token = 'adf76IR/1ngPpucSVYeC4iJ4U4acDB+WDm3X2//OLuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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