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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be656a0ba206e3bb02cce3b499b8bfa66115688d891819504c139260d8c0f3b9' 
  AND token = 'zu2di11BMFw8vA/qodR6tHt+KaeGumTRJ2Y3nFBnKho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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