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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '087c4b2f86e567105f8d3cb254abde79d35e15092176288c585b09b6ac1102ea' 
  AND token = 'SvkUccHde8fmC0aRIJnaDJDFDbXAsRYzSZPKa2s6gKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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