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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27d845c4fb1498e03ed67b583091653246dc5f1fa2050830b5aa32cf9e898547' 
  AND token = 'QA/S4z0xgr+mnl4KxB724QostZ9HfGgp0P0mqaxF5xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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