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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a63ac8fc9850d4c3c7c80f67c1858e78413bf50c358dc29482fa52fac6b642e9' 
  AND token = '0yXZ523j84GnrPv8CwmU0J+2dDjHCpr6y6KAfn3ZNtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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