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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e6f0b5019ee292fa483ec4927154acfc550caa8bee011f80e726d9f669209fd' 
  AND token = 'b8g/uSH+kPop3ekmFI6AEpr8nqTC15TsjqMP77BRYKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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