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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97849bfb87f836ee04c0885a1e1471916c9953fbd0ff3c3b27b78c3e933f19c1' 
  AND token = 'TUaftEwjiTmIRVMdjMveRifRwmQBAyKboy461M1s0z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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