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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0baa0be144e29dcc569d1269c31052c0cfc9aaf3628d563909a94f07802942c4' 
  AND token = '6p3x2395vXAOxFdbCLUiWJZPfbrIE0OH4QNA5X/BzsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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