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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62719fa89be6de0a4d6e879014e04ea6f93629bf474f1b42550d5dbd81ea4a02' 
  AND token = 'c3DPNaRiZeOGEwNmii+k+g4a/y6YGXXwyHsUSPtbmVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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