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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba77e6289fc72d8e58f48ce9cbb368b58a4a1077fe27638034e8838bad2e5fbe' 
  AND token = '3sBGqi7WJkN1FioVvFs3y9XxEXbdXCvA4qAjloNCXAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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