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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b255518c71f69bd73d72437b796bc37b90a0d28b4ab0ae10185fe65e17202ec8' 
  AND token = 'Bgt/+EI9ewxt88/TcsrO4iOFSubwC3CJqWy3XMTPLGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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