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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0c1e1f77ff1226fc9e556d8ededef0cdd550102785f49d15dd5114b9fcb40b9' 
  AND token = 'T4hUk2JPFHJezz3M0ckCtx1JPCmbD5etCK6m8e0myo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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