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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ec28192a3d2bec3e4e55dfcbd78aa37ff557a8d547a205b13cb49b0a04f00f1' 
  AND token = 'n8BC+W0hO8umDwGTOEhJEHquntN/NtSwHukl0M/G+xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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