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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ed8fa95ed75fbf6219793053e58a6e9fd607faa31467109a8cd880ca4d94dd' 
  AND token = 'lHF1y3q+WBiB5LGhpas61M4wQxm5pMEqpzzjMtq6cIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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