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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '152b63a4fb002bb31916e28011937fe93e4f40571eb9bf84c93978c24ee64c15' 
  AND token = 'F9KjDR0xkV6XCLQh6RrjWbkZeR56ct7qXty+ADnzVwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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