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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f438796eabb576b23e2b77b2f582816a9da5e73b451253b3c436e6015be41d1' 
  AND token = 'Pf4Kofp6kRvSVWfRJ2GvKBN2ks73J7V+0HFZKkYvpA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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