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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b49e6ce2e4399fadd27179838af86856e49fe0533183320c33c23bb7d4142f1e' 
  AND token = 'lkZOHZBltpHFT3ePuieXhwAEGm8ZsqMPzQOFWQ4SmGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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