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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '734784b1206209186c5ae365b118a1c11259f614056f9f6dc955b7b00c575d06' 
  AND token = 'xBdUJ7pU+I59tre5/DmtiW3nDWHUrKQ+jFVrT7JMAU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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