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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '629c209d93fdec0ec9cf29287ca9711f515377601ce0f903f0043d092047c7b6' 
  AND token = '4hnU6KTJZwIhYV1Ppge0BqlmoXe4oSLS/wPKpYdDugQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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