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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e13fe7beac6c47292075acdd10c228bfc5a2ad8a2db20f5464a9ab5da8d840' 
  AND token = '8RH9f0q0V1V/TMhOxPMypLHi+UZFNtl0kDrc907h6Lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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