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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a13f58a6cf883470c3fa832851a445ef99f0bc9c40bab33b69e0dfd78a277f41' 
  AND token = 'QOPC9BFwHRCyHh/cO8B1Pt2HlbID1Dkf0mg9utukRV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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