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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dfab08d805f84ce58a163670dcb5e04419ab30ad681bee0f2871e64ef95862f' 
  AND token = 'obXd+s7GvSNKNy7DTBWl4U4X0EA/M0FKYkxnRM2aXr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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