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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f3b68ded00382ab679185afda82ad0a334a0f8da278edeaa8abd4d6fe892787' 
  AND token = 'QdQQFCaIk7h852fpz0v3d/6bLTWLEGczFX95T/we7/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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