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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '243c4eacb1d4d10b1d0a283309ed08d80abc940903c1fc86a3acafe932ed4854' 
  AND token = 'qcajYhDNRxnUZJmZ/Dk9nrleRpoU5S9cAsOS1bNN1d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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