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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c1a8f82861e580f854147d7c9fe85e8933493e4ffd7722579f72d734ee2cf6e' 
  AND token = 'bxuoUhOr1RhFef8OsWJjqdMvtVahkVhUiGAfChTvmz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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