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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39ef5ab5e580ed972d12622fa9df41be41c1b979892413fdfe44bf6e6a99e5d7' 
  AND token = 'EYIpdNe5/MZtdJzXNT8nV5u/n2fY+7b+XH26J2mrk8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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