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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c1d1bdb2912adb89e9f6050edff3cfeaaa94f84ae0653278974055628f1e4fb' 
  AND token = 'Z4dwzTKafHOAabkkacKbKPlLB3/JER5/GRFKzx2TjrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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