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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a097c22778e20638a6964be9f5e5d69ae2b4ea5f8727a527fdc62a652e54c508' 
  AND token = 'kFI1dKgPalfo37GcWsRHgNG+76/NfOtphWthd2aJG+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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