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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c2093ea97aa21d42f723dbb2158fdb17103b7619d8778e940d5b44b244ee473' 
  AND token = 'vBgsuagotbtk5nJLcsRpTCJoLcascRZG7WdKe5hmx7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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