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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f535158a512d8314bb282d2b00c8bf7032d2e73ca2ce6033dcda4e82eed626' 
  AND token = 'bls4p6w7j+jccxyURiHGSN6OsfDq8t8xMCURecdOCuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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