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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20a0019c2506d5775ae940227e5860d59175fb33ce24a4c731e102877190e1ec' 
  AND token = 'V1eGL8IzCHbG/LT9aLAG6tDCJkTv1t0ZVZa46MPJBA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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